Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea8f030e0e1c2f4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 05:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3670abfe2abdce62a03f272b174ef634 SHA-1: 71bc4932f737210700aa2c083ab7a5db32a0352c SHA-256: 5ea8f030e0e1c2f47464589c69302c6057a947822e98ad085aac0af033b8c17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=can+i+play+fifa+mobile+offline PDF link annotation
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/zasozerurazojalonojisun.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613556a99a22c---16943954366.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109120624189963.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/fotirufasiniv.pdfIn PDF document text
    • https://virker-ikke.dk/files/wazajejubij.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/dugefuxuvixolet.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/60979023184.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/59238824867.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9852acdd---90959929845.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/jutosikos.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/88842729157.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b3c35f1bdc1fcbcc56a58965a03ceef1/42782590269.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa09131658---59771238605.pdfIn PDF document text
    • https://emenu.hu/editor_up/9848559554.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/meruvokapan.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/46438c1068cbf679dbcc6de18598193d/guxojade.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/ramewawaxobave.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/69940625871.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gabifizofilinuxaranirale.pdfIn PDF document text
    • http://afslab.asia/upload/files/bamapimeruzezusojokebelap.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef711610---sorazarinuwowowenefo.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/rozizupidutu.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/23d216c3ffa11eda563e9518f8c9a872/96483027470.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/tuketivusevif.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/38577007245.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/1651507345.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jokukukifatawekobazil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA5 17204 bytes
SHA-256: 399cb2c225ff164984757b3c6b968c8769b753195876cdb37367f062fd0f0dee
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10440 bytes
SHA-256: 518cf02b90ad806e7cc7be9a7c7a0c35089521ba44ddde61487c46ba6440c575
font_02_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1